bash-4.2$ hexdump -C beep.tcl
00000000  07                                                |.|
00000001

bash-4.2$ cat beep.tcl          # beep once

bash-4.2$ tclsh beep.tcl        # beep once
invalid command name ""
    while executing
""
    (file "beep.tcl" line 1)

bash-4.2$ hexdump -C beep+.tcl
00000000  70 72 6f 63 20 5c 30 30  37 20 7b 7d 20 7b 7d 0a  |proc \007 {} {}.|
00000010  07                                                |.|
00000011

bash-4.2$ cat beep+.tcl         # beep once
proc \007 {} {}

bash-4.2$ tclsh beep+.tcl       # no beep